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  4. During oogenesis in mammals, the second meiotic division occurs

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Q. During oogenesis in mammals, the second meiotic division occurs

KVPYKVPY 2019

Solution:

The second meiotic division occurs after fertilisation. Oogenesis is the formation of female gametes (egg). Oogenesis begins in female before birth. During early fetal development, germ cell differentiate into oogonia. After several mitotic divisions, oogonia begins meiosis and known as primary oocytes. It remains arrested after diplotene of prophase-I of meiosis-I until the female becomes sexually mature. After puberty, primary oocyte completes meiosis-I and produces secondary oocytes and it arrests at metaphase-II and it completes meiosis -II only after fertilisation.